Durable 253-8766 Cylinder Liner for CAT C18, C32, and 3412D Engines – Engine Cylinder Liner

The cylinder liner provides the critical wearing surface for piston rings and ensures proper compression, oil control, and heat transfer in heavy-duty diesel engines. For the Caterpillar C18, C32, and 3412D engine families, the 253-8766 cylinder liner (also referenced as 2538766) is a precision-engineered replacement component designed to restore bore geometry and extend engine life. Whether you are performing a complete overhaul or repairing a single cylinder, this OEM-grade liner (also known as a wet or dry liner depending on the variant) delivers the fitment, hardness, and thermal stability required for demanding mining, marine, power generation, and industrial applications.

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Engineered for CAT C18, C32, and 3412D Engines

The Cat C18 is an 18.1L inline 6-cylinder, the C32 is a 32.1L V12, and the 3412D is a 27.0L V12 diesel engine – all widely used in heavy equipment, marine propulsion, generator sets, and industrial power units. The 253-8766 liner is typically a wet liner (directly cooled by coolant) made from high-alloy cast iron with a hardened inner bore surface. It is designed to withstand extreme cylinder pressures, high temperatures, and ring wear over thousands of operating hours. This liner matches original specifications for outer diameter, flange height, bore tolerance, and surface finish.

Typical Specifications (Verify for your application):

• Material: High-alloy cast iron (centrifugal cast)

• Liner Type: Wet liner (with coolant contacting outer surface)

• Hardness: 180-240 HB (Brinell)

• Surface Finish: Plateau honed for rapid ring seating

• Bore Diameter:

  • C18: 145mm (5.71 inches)

  • C32: 145mm (5.71 inches)

  • 3412D: 137mm (5.40 inches) – confirm as this part number may be application-specific

Note: The 253-8766 liner may be specifically for C18 and C32 (145mm bore) or for 3412D (137mm). Always verify with your engine serial number and OEM specifications.

Compatibility: Caterpillar Engine Models

This cylinder liner is compatible with the following Caterpillar engine families (verify fitment):

• CAT C18 (Industrial, Marine, Gen Set, ACERT™):
  C18, C18 ACERT, C18 Marine, C18 Generator Set

• CAT C32 (Industrial, Marine, Gen Set, ACERT™):
  C32, C32 ACERT, C32 Marine, C32 Generator Set

• CAT 3412D (Industrial, Marine, Gen Set):
  3412D DIT (Direct Injection Turbocharged)
  3412D DI-TA (Turbo Aftercooled)
  3412D Generator Set

Compatible Caterpillar Equipment – Detailed Model List:

• Mining & Off-Highway Trucks (C32 & 3412D):
  777 (777C, 777D, 777E, 777F, 777G) – C32
  785 (785B, 785C, 785D) – C32
  789 (789B, 789C, 789D) – C32
  793 (793B, 793C, 793D, 793F) – C32
  797 (797, 797B, 797F) – C32

• Excavators (Large – C18 & C32):
  345C, 345C L, 345D, 345D L – C18
  349D, 349D L, 349D2, 349D2 L – C18
  374D L, 374F L – C18
  385C, 385C L, 385C FS – C32
  390D, 390F – C32

• Wheel Loaders (Large – C18 & C32):
  972G, 972G II, 972H, 972K – C18
  980G, 980G II, 980H, 980K – C18
  988F, 988F II, 988G, 988H, 988K – C32
  990, 990 II, 990H, 990K – C32
  992C, 992D, 992G, 992K – C32

• Motor Graders (Large – C18 & 3412D):
  16G, 16H, 16H NA, 16M – C18
  24H, 24M – 3412D (some variants)

• Track-Type Tractors (Bulldozers – C18 & C32):
  D8T, D9T – C18 (some variants)
  D10N, D10R, D10T, D10T2 – C32
  D11N, D11R, D11T – C32

• Marine Propulsion (C18, C32, 3412D):
  CAT C18 marine engines
  CAT C32 marine engines
  CAT 3412D marine engines

• Generator Sets (C18, C32, 3412D):
  CAT C18 generator drive engines (400-600 kW)
  CAT C32 generator drive engines (600-1000+ kW)
  CAT 3412D generator drive engines (300-600 kW)
  Olympian, FG Wilson, and other brands using these base engines

• Industrial Power Units:
  Crushers, pumps, compressors, drilling rigs, material handlers

Why Choose This 253-8766 Cylinder Liner?

1. High Wear Resistance: The inner bore is induction-hardened and plateau-honed to provide excellent ring and piston skirt durability.

2. Precision Machining: Outer diameter and flange height are ground to OEM tolerances (±0.01mm) for proper press-fit or seal retention.

3. Corrosion Protection: Anti-corrosion coating prevents rust during storage and handling.

4. Direct Replacement: Matches original liner protrusion above the block deck for correct head gasket sealing.

Signs You Need New Cylinder Liners

• Excessive oil consumption (blue smoke from exhaust)

• Loss of compression – hard starting or poor power

• Blow-by gases from crankcase breather

• Cylinder bore scoring or scratching visible during inspection

• Engine overheating in specific cylinders

• Rebuilding engine after high-hour operation (preventative replacement)

Installation Recommendations

• Clean the cylinder block bore thoroughly before installation.

• Measure liner protrusion (typically 0.05-0.15mm above deck) using a dial indicator.

• Use a liner press tool – never hammer directly on the liner.

• Replace O-ring seals (for wet liners) with new ones.

• Check liner roundness and bore diameter after installation.

• Follow Caterpillar torque sequence for cylinder head installation.

Conclusion

The 253-8766 (2538766) cylinder liner for CAT C18, C32, and 3412D engines is a high-quality replacement part that restores engine performance and reliability. Whether you are rebuilding a 988K wheel loader, a D11T dozer, a C32 generator set, or a 777 mining truck, this liner ensures proper compression, oil control, and long service life.

Order your 253-8766 liners today and keep your Caterpillar equipment running strong.